Boiler-furnace.



Q Q Ax-m No. 851.088. PATENTED APR. 23, 1907. A. L. HASTINGS.

BOILER FURNACE. APPLICATION FILED JUNE 28.19 06.

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ALONZO L. HASTINGS, OF ALLEGHENY, PENNSYLVANIA.

Specification of Letters Patent.

BOILER-FURNACE.

Patented April 23. 1907.

Application filed June 28, 1906. Serial No. 323.917.

To all whom it may (UH/067"! Be it known that I, ALONZO L. HASTINGS, of Allegheny, Allegheny county, Pennsyl:

vania, have invented a new and useful Im- 1 provement in Boiler-Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specifica tion, in which-- Figure 1 is a longitudinal vertical section of one form of boiler embodying my invention; and Fig. 2 is a cross-section on the line IIII of Fig. 1.

My invention has relation to boiler furnaces, and is designed to provide a furnace having an auxiliary grate composed of a plurality of water tubes which are in communication with the water space of the boiler, thereby providing an increased heating surface. Another object is to provide means for further increasing the heating surface of the boiler by causing the products of combustion to pass through an auxiliary series of water tubes on their ways to the flues.

Other objects of my invention will hereinafter appear.

With these objects in view, my invention consists in the novel construction, arrangement, and combination of parts all as hereinafter described and pointed out in the appended claims.

In the drawings, I have shown my invention as applied to one form of boiler, but its application to other forms will be readily understood by those skilled in the art.

In these drawings, the numeral 2 designates the shell of the boiler, 3 the furnace having the usual grate composed of a series of grate bars 4, and 5 the combustion chamber whose forward wall is formed by the flue sheet 6, and into which the fiues 7 open.

The combustion chamber 5 is partially separated from the furnace proper 3 by means of a depending water space 8 which communicates with the Water space of the boiler. The sheet which forms the walls of this space, or separator, 8, is flanged at its ends, as shown in Fig. 1, and is secured to and carried by the side walls of the fire-box. Its upper rear edge forms a support which carries the crown sheet of the firebox. In the form shown, the furnace is surrounded on all sides, except at the bottom, by a water space of which 9 is the rear leg and 10 the lateral legs or portions.

11 designates an auxiliary grate, which. is composed of a seriesof water tubes, which communicate at one end with the rear water leg 9 and at the opposite end with the water space 8. These tubes are preferably somewhat inclined upwardly from the rear toiward their front ends, and are spaced a slight distance apart so that ashes and partially consumed fuel may fall therethrough uponthe grate 4.

12 indicates a door opening through which fuel can be fed to the auxiliary grate 1.1, and 1. 3 is a similar opening for the lower grate 4, and which also provides means for regulating the draft.

14 designates short water tubes, a series of face for the boiler; they provide a better water circulation; and they constitute a brace for the fire-box, which greatly stiffens the construction.

Combustion takes place on the auxiliary grate formed by the tubes 11, the partially consumed fuel falling through such grate onto the lower grate 4 which may be independently fed, if desired, so as to maintain the proper amount of burning fuel thereon. The water in the tubes 11 and 14 becomes highly heated, thereby very largely increasing the efficiency and economy of the boiler.

Various changes may be made in the construction and arrangement of the boiler and furnace without departing from the spirit and scope of my invention, since What I claim is 1. A boiler furnace having its flue chamber partially separated from the furnace bya water space, aseries ofwater tubesv communicating with said space at one end and with a rear water leg at the opposite end and forming a grate, and a second series of tubes communicating with such space and into the front water leg and extending across the path of the gases where they enter the flue chamber substantially as described.

2. A boiler furnace having the upper portion of its flue chamber separated from the furnace by a water space, and a series of water tubes communicating at one end with the said space and extending across the lower portion of the flue chamber into the front water leg; substantially as described.

8. A boiler furnace having the upper portion of its flue chamber separated from the furnace by a water space, and a series of wa ter tubes communicating at one end with the said space and extending obliquely across the lower portion of the flue chamber into the front water leg; substantially as described.

4. A boiler furnace surrounded on all sides except at the bottom by water spaces of a boiler, and having a series of water tubes communicating at their ends with such spaces and forming an auxiliary grate above the main grate, and a second series of Water tubes also communicating with a water space within the shell of the boiler at one end, and with the front water leg of the boiler at the other end and extending across the path of the gases, where they pass from the furchamber, and having its walls-carried by the side walls of the fire-box and its rear wall supporting the crown-sheet of the fire box, a series of water tubes connecting the rear water leg with the transverse water space and forming an auxiliary grate above the .lower grate, and a second series of water tubes communicating at one end with the said transverse water space, and at the opposite end with a front-water leg; substantially as described.

In testimony whereof, I have hereunto set my hand.

ALONZO L. HASTINGS. Witnesses:

GEo. B. BLEMING, GEO. H. PARMELEE. 

